Steam boiler



June 9, 1931. l l, C; HlcKs 1,809,446

STEAM BOILER Filed June s, 1929 INVENTOR Blf/ww /r5 ATTORNEY PatentedJune 9, 1931 ravine c. HICKS, or rornKa, Kansas, AssieNon or cnn-HALF TonnNnY'v.- srnvnns',

or morena, Kansas STEAM 'Application filed June 8,

My invention relates to steam boilers andA I more particularly/to thedoor end elements of and the crown sheet of excessive heating in` and toconnect the back head and. as to provide,

luence, door sheet in such a manner for different degrees of expansionof said sheets.

A further object of the invention is to adapt. sheet connecting meansfor facilitating the mounting of instruments on the end sheet of aboiler.

In .accomplishing thesev and other objects of the invention, I haveprovided improved details of structure, the preferred forms oit' whichare illustrated in the accompanying drawings, wherein:

Fig. 1 is an elevation half insection of the door end of a boiler.

Fig. 2 is a longitudinal central section through the door end of theboiler including portions of the casing, crown sheet and combustionchamber.

Fig. 8 is an enlarged detail sectiony of a por tion of back anddoorsheets andv my improved method for connecting the same.

Referring in detail to the drawings:

1 designates generally the outer shell or arcuate casing of a boiler,2.a crown sheet forming part of the inner casing spaced from the outercasing to form water legs and comprising the side walls of lthecombustion chamber, and 3 designates generally a rear end wal-lcomprising a fire door sheet Il and an end sheet 5 having registeringcentral openings to comprise the door 6.0i the rear wall. y n The firesheet 4 extends substantially in a plane adapted to intersect the crownsheet, and has an upper edge provided with a de- BOILER 1929. Serial No.369,446.

pressed portion 7 having a return bend at its margin Jforming an.attaching flange 8` adapted to be secured tothe end edge portion 9 ofthe crown sheet.

Y In order to eii'ect this connection the crown sheet is elongated sothat its end 9 will project to and preferably beyond the plane of thelire door sheet 4, whereby the outwardly swelling portion 7 of the doorsheet may eX- tend inwardly of the water leg formed by the door sheet,andv theend .sheet and the edge of the attaching iiange 8 liessubstantiall in the plane of the sheet.

T e annual flange l() at the central door opening` ot the door sheet 4i's-also formed` in a particular manner, being curved rearwardly fromvthe plane of the sheet whereby prod'- ucts of combustion rising inthechamber may move readily over the arcuate door facing into. contact withthe straight portion 11 ofy the inner sheet between the door facing and.the recessed portion 7, and will tend to move across the recessinto'contact with the crown sheet at points spaced from the seam ofthecrown sheet withthe door sheet.

The end sheet isk formed in conformity with the special construction ofthe door sheet, and for this purpose is provided with Va boss-likeprotuberant or swelling portion 12 coinciding with Vthe arcuate bentportion 7 of the door sheet but bent on an arc having a greater radiusthan the arc on which saidl door sheet portion is bent, whereby vtheprojection of the portion 7 into the water leg is compensated for andconstriction of the passage is avoided.V y

The flange 13 at the door opening of the end sheet is arcuately out-bentto form a convex protuberant portion or ring around. the openingand isthen inbent at its inner edge to overlie the flangel of the door sheetfor attachment thereto to seal the joint at the. opening between thedoor and end sheets, the construction varying from common practice inthat the outer face of the end sheet bulges at the opening.

The invention further includes specially applied means for connectingthe end and door sheets, including stay bolts 14 positioned inperpendicular relation with the portions of the surface of the doorsheet in which they are located.

I accomplish the above named result partly by the provision of thedescribed bends in the sheets, and the arrangement is possible becauseof the manner in which I form the inner sheet.

Attention is called to the position of the Stay bolts adjacent the dooropening, the upper stay bolts 15 and 16, for example being inclineddownwardly inwardly, and the stay bolts 17 and 18 below the openingbeing inclined upwardly inwardly, and thus vvary from common practice.

The edges forming the oints between the door sheet and the crown sheet,and the end Sheet and the door sheet at the opening, may be secured bymeans included in classes comprising plugs, patch bolts, rivets, andseams made by fusion welding.

The stay bolts preferably are of fieXible character adapted to myparticular form of end member, and the door sheet preferably hasscrew-threaded apertures 19 to receive the screw-threaded ends 20 of thebolts, and the outer sheets have larger apertures 21 provided withtapering walls 22 in which apertured sockets 23 are fixed as by weldingto receive the spherical heads 24. of. the bolts.

The sockets are mounted with their outer edges substantially registeringwith the outer face of the end sheet and project into the Water leg. andnuts 25 may be screw-threadedly mounted in the sockets to retain thebolts, land fixed in the sockets by welds 26.

In assembling a boiler having the inn'n'oved features described, thesockets are fined in the end sheet, the bolts are inserted through thesockets into'the door sheet apertures, the Spherical heads seating onthe tapering walls of the sockets, and the nuts are applied to retainthe stay bolts against outward movement and thus retain the sheets inspaced relation. The heads of the stay bolts are thus substantiallyrecessed in the end sheet so that the outer surface thereof may be freefor the door frame and for the support of instruments and the like.

In use, the products of combustion will contact the entire surface ofthe door sheet between the opening and the crown sheet with theexception of the relatively small portion in the depression between thedoor sheet and the crown sheet, whereby a maximum heating effect on thewater in the space between the sheets is afforded. The full advantage of the water capacity around the door opening 1s thus availed of, thewater is heated more rapidly, circulation from the end member throughthe boiler is promoted and increased, and water circulation tends toprolong the life of the fire and door sheets since mud and scale areprevented from lodging around the fire door.

The construction illustrated differs from the ordinary construction inimportant particulars, one being the fact that in ordinary constructiona door sheet is formed with inward projections which direct the fireaway from the sheet as it passes from the opening upwardly toward thecrownsheet, whereas .the outward pressing of the door sheet at theopening in my structure provides for the guidance of the flames andgases into contact with the door sheet.

Another distinction is that in ordinary construction, the seam betweenthe door sheet and crown sheet is in such a position that the flamescontact the seam and tend to disrupt it, whereby leaks may be produced,whereas applicant projects the seam into the water leg and thus offsetsit from the path of the flames and hot gases.

Attention is called to the fact that the end sheet is formed tocompensate for the novel structure of the door sheet so thatconstriction of the water leg due to depression of the door sheet at itsupper edge is avoided, and ample capacity at the door opening isafforded.

The welding of the cap nuts in the sockets, which is preferably done byfusion welding, not only retains the nuts but seals the sockets toprevent escape of steam.

That I claim and desire to secure by Letters Patent is:

1. In a steam boiler, an end wall having a door opening and including adoor sheet having a substantially plane inner surface curved rearwardlyat the opening, and an end sheet having an annular flange curvedoutwardly and then inwardly to overlap the door sheet to provideincreased water capacity around the door opening exteriorly of theboiler at said opening. n

2. In a boiler, an end wall including a door. sheet having a dooropening and a substantially plane inner surface curved rearwardly at theopening, and an end sheet spaced from the door sheet and curvedoutwardly and then inwardly at the door opening complementary to thecurvature of the inner sheet to provide a connection between the sheetssubstantially semi-circular in cross section whereby expansion andcontraction between the sheets is compensated for by the curvature ofthe sheets.

3. In a boiler, including a casing sheet and a crown sheet, a door sheethaving a plane inner surface curved rearwardly about a door opening inthe sheet, and a forwardly extending flange offset rearwardly from theinner plane of the door sheet for securing the door sheet to the crownsheet so that products of combustion playing over the inner surface ofthe door sheet will not Contact the oint formed thereby, and an endsheet spaced from the door sheet having an outwardly and inwardly curvedflange overlapping the lange of the door sheet and having an offsetportion opposite said offset flange to provide uniform spacing betweenthe sheets.

4. In a boiler, an end wall having a substantially plane inner surface,a door opening therethrough, and a water leg enlarged outwardly of theboiler eircumferentially of the door opening for providing increasedwater apaoity about said opening. Y I

In testimony whereof I aiix my signature.

IRVING C. HICKS.

